Sign in →

Test Code LAB446 Sodium, 24 Hour Urine

Useful For

  • Monitoring fluid/electrolyte balance
  • Monitoring renal function
  • Evaluating the electrolyte composition of urine

Methodology

Ion-Selective Electrode (ISE)

Performing Laboratory

Bozeman Health Laboratory Services

Specimen Requirements

Specimen Type: Urine
Container/Tube: 24-hour urine collection container
Specimen Volume:

Preferred: 10 mL

Acceptable: Entire collection
Specimen Minimum Volume: 1 mL
Collection Instructions:

  1. Starting and ending times of collection are required.
  2. Collect a 24-hour urine specimen.
  3. No preservative. 
  4. Refrigerate specimen during collection.
  5. Mix well before taking aliquot.
  6. Centrifuge specimen before analysis.
  7. Follow special collection instructions below.

Special Instructions

Specimen Transport Temperature

Refrigerated

Specimen Stability

Specimen Type Temperature Time
Urine Ambient 14 days
  Refrigerated 14 days
  Frozen 1 year

Reference Values

40-220 meq/24 hours

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding

84300-Sodium

81050-Urine timed measurement (if appropriate)